if(strlen($client->client_id) == 0|| strlen($client->client_secret) == 0)
die('Please go to Twitter Apps page https://dev.twitter.com/apps/new , '.'create an application, and in the line '.$application_line.' set the client_id to Consumer key and client_secret with Consumer secret. '.'The Callback URL must be '.$client->redirect_uri.' If you want to post to '.'the user timeline, make sure the application you create has write permissions');